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Achernar

Alpha Eridani

Proper NameAchernar
Bayer DesignationAlpha Eridani
Flamsteed NumberNone
HR (BSC)472
HD10144
ConstellationEridanus
Right Ascension1h 37m 43s
Declination-57° 14' 12"
Distance139 light years
43 parsecs
MagnitudeApparent: +0.54
Absolute: -2.61
Spectral ClassB3Vnp(shell) Blue Main Sequence Star
Optimum VisibilityOctober / November (Usually visible from southern latitudes)
NotesAn eclipsing binary of the Beta Lyrae type, with a white companion star.

A blue main sequence star with an unusual spectrum, Achernar has a magnitude of +0.54, making it the brightest of the stars of Eridanus, and the ninth brightest in the entire sky.

Location of Achernar

Bright Achernar lies at the extreme southern tip of the star-river Eridanus, less than a degree from its southernmost border with neighbouring Hydrus.

Achernar

The river's end: brilliant blue Achernar, the ninth brightest star in the sky, lies at the southern tip of the star-river Eridanus.

Imagery provided by Aladin sky atlas

HR Diagram
Miram
w Carinae
Kapteyn's Star
DO Cephei
Kruger 60 A
La Superba
Kepler-102
Mazaalai
Xi Boötis B
x Carinae
Mekbuda
KR Muscae
Kepler-444
Polis
π Cephei
Pincoya
s Velorum A
Struve 2398 B
ρ Leonis
TZ Arietis
Nashira
Petra
θ Hydrae
ο1 Cygni
Chaophraya
b Velorum
AX Microscopii
AU Microscopii
CS Camelopardalis
41 Draconis
75 Cygni
a Velorum
47 Cygni
Nosaxa
HD 37131
GX Andromedae
Groombridge 1618
Gliese 887
Gliese 687
Gliese 440
IL Aquarii
k Hydrae
HR 6842
Ebla
e Aquilae
Erakis
ε Indi
Felixvarela
Gakyid
d Lupi
ν2 Canis Majoris
Proxima Centauri
FL Virginis
BF Orionis
Betelgeuse
Polaris
Teegarden's Star
ζ Arae
Cerberus
Ran
δ Muscae
Capella
ν Cephei
γ Pavonis
Alnilam
δ Caeli
15 Orionis
Deneb
π5 Orionis
Thabit
Alchiba
τ Ceti
Tevel
Naos
ι1 Scorpii
Koeia
χ Cygni
Alfirk
θ Circini
Antares
ν Persei
ο Capricorni B
Sargas
Azmidi
HR 1911
U Sagittarii
52 Orionis
Schedar
Avior
Atria
Sirius B
61 Cygni A
HD 37130
Sharjah
Mebsuta
Unurgunite
ε Reticuli
UV Ceti
Arneb
σ Orionis
HO Librae
Hind's Crimson Star
Mira
van Maanen's Star
ρ Cygni
Mirfak
Adhafera
Acubens
β Pictoris
Diya
η Carinae
α Centauri A
Dombay
Ross 154
Achird
Mu Aquilae
WX Ursae Majoris
Wolf 498
Wolf 359
Suhail
Wezen
EE Leonis
Berehynia
Hatysa
Sadr
Tureis
Rigel
Achernar

Hertzprung-Russell diagram plotting the temperature and luminosity of Achernar (marked by the red circle) relative to other stars.

Indexes

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